Improvement in machinery for punching metals



D. T. WALKER.

, Meta Punch'.

No. 49,937. Patented-Sept. l2, 1865.

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UNITED STATES PATENT OFFICE.

DANIEL T. WALKER, OF BROOKLYN, E. D., NEW YORK.

IMPROVEMENT IN MACHINERY FOR PUNCHING METALS.

Specification forming part of Letters Patent No. 49,937, dated September12, 1865,

To all whom fit 'may concern:

Be it known that I, DANIEL T. WALKER, of the city of Brooklyn, EasternDistrict, county of Kings, and State of New York, have invented ImprovedMachinery for Punchin g Metals 5 and I do hereby declare that thefollowing is a full and correct description thereof', reference beinghad to the accompanying drawings, and to the letters of referencethereon.

My said invention consists in an improved punch-holder, and also of apeculiar form of punch to be used in the punch-holder.

In order to particularly describe my invenlion I will refer to thedra-wings, of which- Figure 1 is a longitudinal section, showing punchand holder, the red lines showing a modiication of construction whichadapts the holder to different-sized punches; Fi g. 2, a perspectiveoutside view of punch and holder as used; Fig. 3, a section of the coneor socket of the punchholder; Fig. 4, detached view of punch; Fig. 5,section ot' bush used for small punch.

The punch-holder consists of two parts, a and a. The large solid part,a, has a taper-shank, b, of suitable size to tit a taper hole or recessin the sliding bolster or head of a punchingmachine. Below the shoulder'c of the tapershank the piece c tapers down to a diameter equal to thelargest punch-head for which it is intended. The hollow part a of thepunchholder is also interiorly of a taper corresponding to that of thesolid part a and the head of the punch c, which, it will be observed, isalso conical or tapering in form.

The punch cis a short cylinder of steel, having a head, c', of a tapercorrespondin g to that of the hollow part, a.

When punches of a smaller size are to be used a conical bush, d, isnecessary, unless the punch-head be made with a shoulder, which would bea waste of metal and work, as one bush will ontlast many punches.

The parts are put together as shown in the drawings, and secured by apinor key, e, driven through holes in the parts.

By this inode ot' construction the punch itseit' is reduced to a verysmall piece of metal and can be renewed at a triing expense, and yet aiirm and sufficiently-solid connection with a punchin g-niachineisobtained to punch boilerplate and other heavy plate metal. 'Ihe solidpart a being in contact with the head of the punch becomes a driver ofthe punch in all cases, whether the punch is large or srnall. The hollowor conical part a is the cap to hold the punch to the driver, and alsoto hold the bushes when used. The red lines, Fig. 1,show the arrangementof bush and small punch.

I claim- 1. rIhe improved punch-holder, consistin g of the driver a, thecap a', and a fastening, substantially as described.

2. The driver, conical cap, fastening, and punch, in combination,substantially as described.

3. The conical bush, in combination with the cap and driver, for thepurpose of holding various-sized punches in the same punch-holder,substantially as described.

DANIEL T. VALKER.

Vitnesses:

F. (l. TEEADWELL, Jr., JACOB DRAKE.

